Mechanical movement.



No. 645,463. Patented Mar. I3, I900.

J. K. E. DIFFENDERFFEB.

MECHANICAL MOVEMENT.

(Application filed Aug. 31, 1899.)

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("0 Model.)

No. 645,463. Patented Mar. l3, I900. J. K. E. DIFFENDERFFER.

IVIEIEHANIGAL MOVEMENT.-

(Application filed Aug. 31, 1899.)

2 Sheets-Sheet 2.

(No Model.)

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NITED STATES JOHN K. E. DIFFENDERFFER, OF BALTIMORE, MARYLAND.

MECHANICAL MOVEMENT.

SPECIFICATION forming part of Letters Patent l q o. 645,463, dated March13, 1900.

Application filed August 31 1399. Serial No. 729,020. (No model.)

To all whom it may concern:

Be it known that I, JOHN K.E. DIFFENDERF- FER, of the city of Baltimore,in the State of Maryland, have invented certain Improvements inMechanical Movements, of which the following is a specification.

This invention relates to certain improvements in that class ofmechanical movements in which the rotation of one shaft is communicatedto another at a right angle thereto through the medium of screw-gearing,as will hereinafter fully appear.

In the further description of the said invention which follows referenceis made to the accompanying drawings, forming a part hereof, and inwhich- Figure 1 is a partly-sectional View of the improved mechanicalmovement with the driven shaft shown in a horizontal position and infull. Fig. 2 is a partly-sectional view of the mechanical movementlooking from the upper end of the driven shaft. Fig. 3 is an exteriorview of parts of Fig. 2. Fig. 4 is an exterior view of Fig. 2,illustrating a modifioation in the arrangement of certain parts of theapparatus, as hereinafter described.

Referring now to Figs. 1, 2, and 3 of the drawings, A is the drivenshaft, having secured thereto an ordinary worm-Wheel B.

C and D are worms in gear with the wormwheel B. The said worms areplaced diametrically opposite to each other, and their shafts a and bare provided with spur gear-Wheels E and F, the teeth of which are inmesh, so that the rotation of one worm will effect the rotation of theother, but in the reverse di rection. The worm-shaft ct is the driver,and motion is communicated thereto through the agency of the universaljoint or coupling G; but the present invention does not extend beyondthe driving-shaft a.

H is a casing of any appropriate construction, which incloses thegearing described, and it is provided with the lug 0, adapted to befastened to any stationary object to prevent the worms revolving aboutthe wormwheel instead of effecting the rotation of the latter.

The worm-shafts are provided with hollowfaced collars cl, and theopenings in the body portion of the casing H, through which theworm-shafts extend, with corresponding collars e, and between thecollars of the shafts and those in the casing are placed balls f to formball-bearings for the shafts.

To prevent all the work being done by one of the worms and to equalizethe strain and friction on both worms, the holes h in the casing,through which the driven shaft passes, are elongated. (See Fig. 2, inwhich the said elongated holes are shown in dotted lines.) With thisconstruction and arrangement the driven shaft slides slightly in itsbearings and automatically adj usts-itself, so that the threads of thetwo worms bear with'a common strain against the teeth of the WO1II1-'-wheel.

In Fig. 4 the driven shaft A passes through bearing-boxes I, only one ofwhich is shown, the other being underneath the casing, which areattached to the casing by means of bolts The holes j in thebearing-boxes through which the bolts '5 pass are elongated to admit ofthe adjustment of the Worms with reference to the worm-wheel,as beforedescribed.

From the foregoing description it will be understood that the worm-wheelbeing driven from opposite sides is held in a central positionindependently of the bearings of the shaft, and in consequence frictionin the bearings is much reduced.

I claim as my invention- 1. In combination with two worms carryinggear-wheels which are in mesh with each other'so that the worms willrotate in opposite directions, a shaft having thereon a wormwheel theteeth of which are in mesh with the threads of the worms,the saidworm-wheel ,a worm-wheel the teeth of which are in mesh with the threadsof the worms, a driven shaft which is tight in the said worm-Wheel, andbearings for the said shaft which are elongated so that the said shaftand worm-wheel will have some self-adjustment and thereby wheel shaftpasses to admit of the self-adjustment of the worms with reference tothe said worm-wheel in order that the threads of the said worms may bearequally against the teeth of the Worm -Wheel, substantially asspecified. V

JOHN K. EFDIFFENDERFFER.

Witnesses:

WM. T. HOWARD, HARRY E. FEE.

